<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // var arr =  [{name:"张三",age:20},{name:"李四",age:23},{name:"王五",age:19}];
        // var arr  = [1,2,3];
        var arr =  [{name:"张三",age:20},{name:"李四",age:23},{name:"王五",age:19}];
        // arr.forEach(function(item){
        //     // console.log(item);
        //     console.log("姓名是"+item.name+"年龄是"+item.age);
        // })

        // var newArr = arr.map(function(item){
        //     return item.age;
        // })
        // console.log(newArr);


    //  var res =  arr.filter(function(item){
    //         return item.age>=20
    //     })
    //     console.log(res);

    </script>
</body>
</html>